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Condensing boilers are an important tool in achieving optimum energy efficiency in hydronic boiler and water heating systems, according to industry experts, proven by thousands of installations by condensing boiler manufacturers throughout the world.
Yet as with any type of equipment or installation, there are pitfalls to avoid and choices to be made with regard to understanding where such an application can best be used, how it should be sized and the best way to install it.
We asked makers of condensing boilers to give Reeves Journal an update on the state of the condensing boiler market in the United States and share some tips for contractors who install the units. The expert responses come from Jeff Vallett II and Paul Rohrs of Lochinvar, Gerry Clisham of Triangle Tube, and Terry Doyle, Stan Young and Larry J. Ashton of Raypak.
RJ: What are the pros and cons of using a condensing boiler?
Triangle Tube: The benefits of condensing boilers start with the energy savings, achieved not only by having a more efficient heat exchange system as is revealed by AFUE (annual fuel utilization efficiency) data, but also in using technology better in this system. This technology includes outdoor reset, modulation, sealed combustion and low standby losses. These savings are not included in the AFUE data.
The cons are that condensing boilers require a more extensive system design to best fit the complete hydronic system with the home. More training is required to understand how to use the boiler, but this makes not only the boiler, but the entire hydronic system more efficient.
Lochinvar: Pros - There is a potential for increased efficiency, which will reduce the amount of fuel burned versus a lesserefficiency boiler. With less fuel burned, emissions and fuel bills are reduced. Ease of installation with non-metallic venting capabilities, light-weight design and small footprint.
Cons - Products produce a slightly-acidic flue gas condensate, which should be neutralized before being introduced into the wastewater system.
Raypak: Pros - The primary advantage is the potential for higher efficiency, which is only attainable with properlydesigned systems at relatively low water temperatures. Water temperature entering the boiler must be below the dew point of the combustion products, always less than 140 degrees F and usually no...